/* $OpenBSD: if_ppp.c,v 1.118 2024/02/28 16:08:34 denis Exp $ */ /* $NetBSD: if_ppp.c,v 1.39 1997/05/17 21:11:59 christos Exp $ */ /* * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Based on: * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 * * Copyright (c) 1987, 1989, 1992, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Serial Line interface * * Rick Adams * Center for Seismic Studies * 1300 N 17th Street, Suite 1450 * Arlington, Virginia 22209 * (703)276-7900 * rick@seismo.ARPA * seismo!rick * * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). * Converted to 4.3BSD Beta by Chris Torek. * Other changes made at Berkeley, based in part on code by Kirk Smith. * * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) * Added VJ tcp header compression; more unified ioctls * * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). * Cleaned up a lot of the mbuf-related code to fix bugs that * caused system crashes and packet corruption. Changed pppstart * so that it doesn't just give up with a collision if the whole * packet doesn't fit in the output ring buffer. * * Added priority queueing for interactive IP packets, following * the model of if_sl.c, plus hooks for bpf. * Paul Mackerras (paulus@cs.anu.edu.au). */ /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ #include "ppp.h" #if NPPP > 0 #define VJC #define PPP_COMPRESS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bpfilter.h" #ifdef VJC #include #endif #include #include #include #ifdef PPP_COMPRESS #define PACKETPTR struct mbuf * #include #endif static int pppsioctl(struct ifnet *, u_long, caddr_t); static void ppp_requeue(struct ppp_softc *); static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); static void ppp_ccp_closed(struct ppp_softc *); static void ppp_inproc(struct ppp_softc *, struct mbuf *); static void pppdumpm(struct mbuf *m0); static void ppp_ifstart(struct ifnet *ifp); int ppp_clone_create(struct if_clone *, int); int ppp_clone_destroy(struct ifnet *); void ppp_pkt_list_init(struct ppp_pkt_list *, u_int); int ppp_pkt_enqueue(struct ppp_pkt_list *, struct ppp_pkt *); struct ppp_pkt *ppp_pkt_dequeue(struct ppp_pkt_list *); struct mbuf *ppp_pkt_mbuf(struct ppp_pkt *); /* * We steal two bits in the mbuf m_flags, to mark high-priority packets * for output, and received packets following lost/corrupted packets. */ #define M_ERRMARK M_LINK0 /* steal a bit in mbuf m_flags */ #ifdef PPP_COMPRESS /* * List of compressors we know about. */ extern struct compressor ppp_bsd_compress; extern struct compressor ppp_deflate, ppp_deflate_draft; struct compressor *ppp_compressors[] = { #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) &ppp_bsd_compress, #endif #if DO_DEFLATE && defined(PPP_DEFLATE) &ppp_deflate, &ppp_deflate_draft, #endif NULL }; #endif /* PPP_COMPRESS */ LIST_HEAD(, ppp_softc) ppp_softc_list; struct if_clone ppp_cloner = IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); /* * Called from boot code to establish ppp interfaces. */ void pppattach(void) { LIST_INIT(&ppp_softc_list); if_clone_attach(&ppp_cloner); } int ppp_clone_create(struct if_clone *ifc, int unit) { struct ppp_softc *sc; struct ifnet *ifp; sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); sc->sc_unit = unit; ifp = &sc->sc_if; snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); sc->sc_if.if_softc = sc; sc->sc_if.if_mtu = PPP_MTU; sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; sc->sc_if.if_type = IFT_PPP; sc->sc_if.if_hdrlen = PPP_HDRLEN; sc->sc_if.if_ioctl = pppsioctl; sc->sc_if.if_output = pppoutput; sc->sc_if.if_start = ppp_ifstart; sc->sc_if.if_rtrequest = p2p_rtrequest; mq_init(&sc->sc_inq, IFQ_MAXLEN, IPL_NET); ppp_pkt_list_init(&sc->sc_rawq, IFQ_MAXLEN); if_attach(&sc->sc_if); if_alloc_sadl(&sc->sc_if); #if NBPFILTER > 0 bpfattach(&ifp->if_bpf, ifp, DLT_PPP, PPP_HDRLEN); #endif NET_LOCK(); LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list); NET_UNLOCK(); return (0); } int ppp_clone_destroy(struct ifnet *ifp) { struct ppp_softc *sc = ifp->if_softc; if (sc->sc_devp != NULL) return (EBUSY); NET_LOCK(); LIST_REMOVE(sc, sc_list); NET_UNLOCK(); if_detach(ifp); free(sc, M_DEVBUF, 0); return (0); } /* * Allocate a ppp interface unit and initialize it. */ struct ppp_softc * pppalloc(pid_t pid) { int i; struct ppp_softc *sc; NET_LOCK(); LIST_FOREACH(sc, &ppp_softc_list, sc_list) { if (sc->sc_xfer == pid) { sc->sc_xfer = 0; NET_UNLOCK(); return sc; } } LIST_FOREACH(sc, &ppp_softc_list, sc_list) { if (sc->sc_devp == NULL) break; } NET_UNLOCK(); if (sc == NULL) return NULL; sc->sc_flags = 0; sc->sc_mru = PPP_MRU; sc->sc_relinq = NULL; bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); #ifdef VJC sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); if (sc->sc_comp) sl_compress_init(sc->sc_comp); #endif #ifdef PPP_COMPRESS sc->sc_xc_state = NULL; sc->sc_rc_state = NULL; #endif /* PPP_COMPRESS */ for (i = 0; i < NUM_NP; ++i) sc->sc_npmode[i] = NPMODE_ERROR; ml_init(&sc->sc_npqueue); sc->sc_last_sent = sc->sc_last_recv = getuptime(); return sc; } /* * Deallocate a ppp unit. */ void pppdealloc(struct ppp_softc *sc) { struct ppp_pkt *pkt; NET_LOCK(); if_down(&sc->sc_if); sc->sc_if.if_flags &= ~IFF_RUNNING; sc->sc_devp = NULL; sc->sc_xfer = 0; while ((pkt = ppp_pkt_dequeue(&sc->sc_rawq)) != NULL) ppp_pkt_free(pkt); mq_purge(&sc->sc_inq); ml_purge(&sc->sc_npqueue); m_freem(sc->sc_togo); sc->sc_togo = NULL; #ifdef PPP_COMPRESS ppp_ccp_closed(sc); sc->sc_xc_state = NULL; sc->sc_rc_state = NULL; #endif /* PPP_COMPRESS */ #if NBPFILTER > 0 if (sc->sc_pass_filt.bf_insns != 0) { free(sc->sc_pass_filt.bf_insns, M_DEVBUF, 0); sc->sc_pass_filt.bf_insns = 0; sc->sc_pass_filt.bf_len = 0; } if (sc->sc_active_filt.bf_insns != 0) { free(sc->sc_active_filt.bf_insns, M_DEVBUF, 0); sc->sc_active_filt.bf_insns = 0; sc->sc_active_filt.bf_len = 0; } #endif #ifdef VJC if (sc->sc_comp != 0) { free(sc->sc_comp, M_DEVBUF, 0); sc->sc_comp = 0; } #endif NET_UNLOCK(); } /* * Ioctl routine for generic ppp devices. */ int pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag, struct proc *p) { int s, error, flags, mru, npx; u_int nb; struct ppp_option_data *odp; struct compressor **cp; struct npioctl *npi; time_t t; #if NBPFILTER > 0 struct bpf_program *bp, *nbp; struct bpf_insn *newcode, *oldcode; int newcodelen; #endif #ifdef PPP_COMPRESS u_char ccp_option[CCP_MAX_OPTION_LENGTH]; #endif switch (cmd) { case FIONREAD: *(int *)data = mq_len(&sc->sc_inq); break; case PPPIOCGUNIT: *(int *)data = sc->sc_unit; /* XXX */ break; case PPPIOCGFLAGS: *(u_int *)data = sc->sc_flags; break; case PPPIOCSFLAGS: if ((error = suser(p)) != 0) return (error); flags = *(int *)data & SC_MASK; #ifdef PPP_COMPRESS if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) ppp_ccp_closed(sc); #endif s = splnet(); sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; splx(s); break; case PPPIOCSMRU: if ((error = suser(p)) != 0) return (error); mru = *(int *)data; if (mru >= PPP_MRU && mru <= PPP_MAXMRU) sc->sc_mru = mru; break; case PPPIOCGMRU: *(int *)data = sc->sc_mru; break; #ifdef VJC case PPPIOCSMAXCID: if ((error = suser(p)) != 0) return (error); if (sc->sc_comp) sl_compress_setup(sc->sc_comp, *(int *)data); break; #endif case PPPIOCXFERUNIT: if ((error = suser(p)) != 0) return (error); sc->sc_xfer = p->p_p->ps_pid; break; #ifdef PPP_COMPRESS case PPPIOCSCOMPRESS: if ((error = suser(p)) != 0) return (error); odp = (struct ppp_option_data *) data; nb = odp->length; if (nb > sizeof(ccp_option)) nb = sizeof(ccp_option); if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) return (error); /* preliminary check on the length byte */ if (ccp_option[1] < 2) return (EINVAL); for (cp = ppp_compressors; *cp != NULL; ++cp) if ((*cp)->compress_proto == ccp_option[0]) { /* * Found a handler for the protocol - try to allocate * a compressor or decompressor. */ error = 0; if (odp->transmit) { if (sc->sc_xc_state != NULL) { (*sc->sc_xcomp->comp_free)( sc->sc_xc_state); } sc->sc_xcomp = *cp; sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); if (sc->sc_xc_state == NULL) { if (sc->sc_flags & SC_DEBUG) printf( "%s: comp_alloc failed\n", sc->sc_if.if_xname); error = ENOBUFS; } s = splnet(); sc->sc_flags &= ~SC_COMP_RUN; splx(s); } else { if (sc->sc_rc_state != NULL) { (*sc->sc_rcomp->decomp_free)( sc->sc_rc_state); } sc->sc_rcomp = *cp; sc->sc_rc_state = (*cp)->decomp_alloc( ccp_option, nb); if (sc->sc_rc_state == NULL) { if (sc->sc_flags & SC_DEBUG) { printf( "%s: decomp_alloc failed\n", sc->sc_if.if_xname); } error = ENOBUFS; } s = splnet(); sc->sc_flags &= ~SC_DECOMP_RUN; splx(s); } return (error); } if (sc->sc_flags & SC_DEBUG) { printf("%s: no compressor for [%x %x %x], %x\n", sc->sc_if.if_xname, ccp_option[0], ccp_option[1], ccp_option[2], nb); } return (EINVAL); /* no handler found */ #endif /* PPP_COMPRESS */ case PPPIOCGNPMODE: case PPPIOCSNPMODE: npi = (struct npioctl *)data; switch (npi->protocol) { case PPP_IP: npx = NP_IP; break; #ifdef INET6 case PPP_IPV6: npx = NP_IPV6; break; #endif default: return EINVAL; } if (cmd == PPPIOCGNPMODE) { npi->mode = sc->sc_npmode[npx]; } else { if ((error = suser(p)) != 0) return (error); if (npi->mode != sc->sc_npmode[npx]) { sc->sc_npmode[npx] = npi->mode; if (npi->mode != NPMODE_QUEUE) { ppp_requeue(sc); (*sc->sc_start)(sc); } } } break; case PPPIOCGIDLE: t = getuptime(); ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; break; #if NBPFILTER > 0 case PPPIOCSPASS: case PPPIOCSACTIVE: nbp = (struct bpf_program *) data; if ((unsigned) nbp->bf_len > BPF_MAXINSNS) return EINVAL; newcodelen = nbp->bf_len * sizeof(struct bpf_insn); if (nbp->bf_len != 0) { newcode = mallocarray(nbp->bf_len, sizeof(struct bpf_insn), M_DEVBUF, M_WAITOK); if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, newcodelen)) != 0) { free(newcode, M_DEVBUF, 0); return error; } if (!bpf_validate(newcode, nbp->bf_len)) { free(newcode, M_DEVBUF, 0); return EINVAL; } } else newcode = 0; bp = (cmd == PPPIOCSPASS) ? &sc->sc_pass_filt : &sc->sc_active_filt; oldcode = bp->bf_insns; s = splnet(); bp->bf_len = nbp->bf_len; bp->bf_insns = newcode; splx(s); if (oldcode != 0) free(oldcode, M_DEVBUF, 0); break; #endif default: return (-1); } return (0); } /* * Process an ioctl request to the ppp network interface. */ static int pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct ppp_softc *sc = ifp->if_softc; struct ifaddr *ifa = (struct ifaddr *)data; struct ifreq *ifr = (struct ifreq *)data; struct ppp_stats *psp; #ifdef PPP_COMPRESS struct ppp_comp_stats *pcp; #endif int s = splnet(), error = 0; switch (cmd) { case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_RUNNING) == 0) ifp->if_flags &= ~IFF_UP; break; case SIOCSIFADDR: case SIOCSIFDSTADDR: switch (ifa->ifa_addr->sa_family) { case AF_INET: break; #ifdef INET6 case AF_INET6: break; #endif default: error = EAFNOSUPPORT; break; } break; case SIOCSIFMTU: sc->sc_if.if_mtu = ifr->ifr_mtu; break; case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCGPPPSTATS: psp = &((struct ifpppstatsreq *) data)->stats; bzero(psp, sizeof(*psp)); psp->p = sc->sc_stats; #if defined(VJC) && !defined(SL_NO_STATS) if (sc->sc_comp) { psp->vj.vjs_packets = sc->sc_comp->sls_packets; psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; psp->vj.vjs_searches = sc->sc_comp->sls_searches; psp->vj.vjs_misses = sc->sc_comp->sls_misses; psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; } #endif /* VJC */ break; #ifdef PPP_COMPRESS case SIOCGPPPCSTATS: pcp = &((struct ifpppcstatsreq *) data)->stats; bzero(pcp, sizeof(*pcp)); if (sc->sc_xc_state != NULL) (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); if (sc->sc_rc_state != NULL) (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); break; #endif /* PPP_COMPRESS */ default: error = ENOTTY; } splx(s); return (error); } /* * Queue a packet. Start transmission if not active. * Packet is placed in Information field of PPP frame. */ int pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, struct rtentry *rtp) { struct ppp_softc *sc = ifp->if_softc; int protocol, address, control; u_char *cp; int error; enum NPmode mode; int len; if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { error = ENETDOWN; /* sort of */ goto bad; } #ifdef DIAGNOSTIC if (ifp->if_rdomain != rtable_l2(m0->m_pkthdr.ph_rtableid)) { printf("%s: trying to send packet on wrong domain. " "if %d vs. mbuf %d, AF %d\n", ifp->if_xname, ifp->if_rdomain, rtable_l2(m0->m_pkthdr.ph_rtableid), dst->sa_family); } #endif /* * Compute PPP header. */ switch (dst->sa_family) { case AF_INET: address = PPP_ALLSTATIONS; control = PPP_UI; protocol = PPP_IP; mode = sc->sc_npmode[NP_IP]; break; #ifdef INET6 case AF_INET6: address = PPP_ALLSTATIONS; control = PPP_UI; protocol = PPP_IPV6; mode = sc->sc_npmode[NP_IPV6]; break; #endif case AF_UNSPEC: address = PPP_ADDRESS(dst->sa_data); control = PPP_CONTROL(dst->sa_data); protocol = PPP_PROTOCOL(dst->sa_data); mode = NPMODE_PASS; break; default: printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); error = EAFNOSUPPORT; goto bad; } /* * Drop this packet, or return an error, if necessary. */ if (mode == NPMODE_ERROR) { error = ENETDOWN; goto bad; } if (mode == NPMODE_DROP) { error = 0; goto bad; } /* * Add PPP header. If no space in first mbuf, allocate another. */ M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; goto bad; } cp = mtod(m0, u_char *); *cp++ = address; *cp++ = control; *cp++ = protocol >> 8; *cp++ = protocol & 0xff; if ((m0->m_flags & M_PKTHDR) == 0) panic("mbuf packet without packet header!"); len = m0->m_pkthdr.len; if (sc->sc_flags & SC_LOG_OUTPKT) { printf("%s output: ", ifp->if_xname); pppdumpm(m0); } if ((protocol & 0x8000) == 0) { #if NBPFILTER > 0 /* * Apply the pass and active filters to the packet, * but only if it is a data packet. */ *mtod(m0, u_char *) = 1; /* indicates outbound */ if (sc->sc_pass_filt.bf_insns != 0 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *)m0, len, 0) == 0) { error = 0; /* drop this packet */ goto bad; } /* * Update the time we sent the most recent packet. */ if (sc->sc_active_filt.bf_insns == 0 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *)m0, len, 0)) sc->sc_last_sent = getuptime(); *mtod(m0, u_char *) = address; #else /* * Update the time we sent the most recent packet. */ sc->sc_last_sent = getuptime(); #endif } #if NBPFILTER > 0 /* See if bpf wants to look at the packet. */ if (ifp->if_bpf) bpf_mtap(ifp->if_bpf, m0, BPF_DIRECTION_OUT); #endif /* * Put the packet on the appropriate queue. */ if (mode == NPMODE_QUEUE) { /* XXX we should limit the number of packets on this queue */ ml_enqueue(&sc->sc_npqueue, m0); } else { error = ifq_enqueue(&sc->sc_if.if_snd, m0); if (error) { sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; return (error); } (*sc->sc_start)(sc); } ifp->if_opackets++; ifp->if_obytes += len; return (0); bad: m_freem(m0); return (error); } /* * After a change in the NPmode for some NP, move packets from the * npqueue to the send queue or the fast queue as appropriate. */ static void ppp_requeue(struct ppp_softc *sc) { struct mbuf_list ml = MBUF_LIST_INITIALIZER(); struct mbuf *m; enum NPmode mode; int error; while ((m = ml_dequeue(&sc->sc_npqueue)) != NULL) { switch (PPP_PROTOCOL(mtod(m, u_char *))) { case PPP_IP: mode = sc->sc_npmode[NP_IP]; break; #ifdef INET6 case PPP_IPV6: mode = sc->sc_npmode[NP_IPV6]; break; #endif default: mode = NPMODE_PASS; } switch (mode) { case NPMODE_PASS: error = ifq_enqueue(&sc->sc_if.if_snd, m); if (error) { sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; } break; case NPMODE_DROP: case NPMODE_ERROR: m_freem(m); break; case NPMODE_QUEUE: ml_enqueue(&ml, m); break; } } sc->sc_npqueue = ml; } /* * Transmitter has finished outputting some stuff; */ void ppp_restart(struct ppp_softc *sc) { int s = splnet(); sc->sc_flags &= ~SC_TBUSY; schednetisr(NETISR_PPP); splx(s); } /* * Get a packet to send. */ struct mbuf * ppp_dequeue(struct ppp_softc *sc) { struct mbuf *m, *mp; u_char *cp; int address, control, protocol; /* * Grab a packet to send: first try the fast queue, then the * normal queue. */ m = ifq_dequeue(&sc->sc_if.if_snd); if (m == NULL) return NULL; ++sc->sc_stats.ppp_opackets; /* * Extract the ppp header of the new packet. * The ppp header will be in one mbuf. */ cp = mtod(m, u_char *); address = PPP_ADDRESS(cp); control = PPP_CONTROL(cp); protocol = PPP_PROTOCOL(cp); switch (protocol) { case PPP_IP: #ifdef VJC /* * If the packet is a TCP/IP packet, see if we can compress it. */ if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { struct ip *ip; int type; mp = m; ip = (struct ip *)(cp + PPP_HDRLEN); if (mp->m_len <= PPP_HDRLEN) { mp = mp->m_next; if (mp == NULL) break; ip = mtod(mp, struct ip *); } /* * this code assumes the IP/TCP header is in one * non-shared mbuf. */ if (ip->ip_p == IPPROTO_TCP) { type = sl_compress_tcp(mp, ip, sc->sc_comp, !(sc->sc_flags & SC_NO_TCP_CCID)); switch (type) { case TYPE_UNCOMPRESSED_TCP: protocol = PPP_VJC_UNCOMP; break; case TYPE_COMPRESSED_TCP: protocol = PPP_VJC_COMP; cp = mtod(m, u_char *); cp[0] = address; /* header has moved */ cp[1] = control; cp[2] = 0; break; } /* update protocol in PPP header */ cp[3] = protocol; } } #endif /* VJC */ break; #ifdef PPP_COMPRESS case PPP_CCP: ppp_ccp(sc, m, 0); break; #endif /* PPP_COMPRESS */ } #ifdef PPP_COMPRESS if (protocol != PPP_LCP && protocol != PPP_CCP && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { struct mbuf *mcomp = NULL; int slen; slen = 0; for (mp = m; mp != NULL; mp = mp->m_next) slen += mp->m_len; (*sc->sc_xcomp->compress)(sc->sc_xc_state, &mcomp, m, slen, (sc->sc_flags & SC_CCP_UP ? sc->sc_if.if_mtu + PPP_HDRLEN : 0)); if (mcomp != NULL) { if (sc->sc_flags & SC_CCP_UP) { /* Send the compressed packet instead. */ m_freem(m); m = mcomp; cp = mtod(m, u_char *); protocol = cp[3]; } else { /* * Can't transmit compressed packets until * CCP is up. */ m_freem(mcomp); } } } #endif /* PPP_COMPRESS */ /* * Compress the address/control and protocol, if possible. */ if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && control == PPP_UI && protocol != PPP_ALLSTATIONS && protocol != PPP_LCP) { /* can compress address/control */ m->m_data += 2; m->m_len -= 2; } if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { /* can compress protocol */ if (mtod(m, u_char *) == cp) { cp[2] = cp[1]; /* move address/control up */ cp[1] = cp[0]; } ++m->m_data; --m->m_len; } return m; } /* * Software interrupt routine. */ void pppintr(void) { struct ppp_softc *sc; int s; struct ppp_pkt *pkt; struct mbuf *m; NET_ASSERT_LOCKED(); LIST_FOREACH(sc, &ppp_softc_list, sc_list) { if (!(sc->sc_flags & SC_TBUSY) && (!ifq_empty(&sc->sc_if.if_snd))) { s = splnet(); sc->sc_flags |= SC_TBUSY; splx(s); (*sc->sc_start)(sc); } while ((pkt = ppp_pkt_dequeue(&sc->sc_rawq)) != NULL) { m = ppp_pkt_mbuf(pkt); if (m == NULL) continue; ppp_inproc(sc, m); } } } #ifdef PPP_COMPRESS /* * Handle a CCP packet. `rcvd' is 1 if the packet was received, * 0 if it is about to be transmitted. */ static void ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) { u_char *dp, *ep; struct mbuf *mp; int slen, s; /* * Get a pointer to the data after the PPP header. */ if (m->m_len <= PPP_HDRLEN) { mp = m->m_next; if (mp == NULL) return; dp = mtod(mp, u_char *); } else { mp = m; dp = mtod(mp, u_char *) + PPP_HDRLEN; } ep = mtod(mp, u_char *) + mp->m_len; if (dp + CCP_HDRLEN > ep) return; slen = CCP_LENGTH(dp); if (dp + slen > ep) { if (sc->sc_flags & SC_DEBUG) { printf("if_ppp/ccp: not enough data in mbuf" " (%p+%x > %p+%x)\n", dp, slen, mtod(mp, u_char *), mp->m_len); } return; } switch (CCP_CODE(dp)) { case CCP_CONFREQ: case CCP_TERMREQ: case CCP_TERMACK: /* CCP must be going down - disable compression */ if (sc->sc_flags & SC_CCP_UP) { s = splnet(); sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); splx(s); } break; case CCP_CONFACK: if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) && slen >= CCP_HDRLEN + CCP_OPT_MINLEN && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { if (!rcvd) { /* we're agreeing to send compressed packets. */ if (sc->sc_xc_state != NULL && (*sc->sc_xcomp->comp_init)(sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { s = splnet(); sc->sc_flags |= SC_COMP_RUN; splx(s); } } else { /* peer agrees to send compressed packets */ if (sc->sc_rc_state != NULL && (*sc->sc_rcomp->decomp_init)( sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, sc->sc_unit, 0, sc->sc_mru, sc->sc_flags & SC_DEBUG)) { s = splnet(); sc->sc_flags |= SC_DECOMP_RUN; sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); splx(s); } } } break; case CCP_RESETACK: if (sc->sc_flags & SC_CCP_UP) { if (!rcvd) { if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { (*sc->sc_xcomp->comp_reset)( sc->sc_xc_state); } } else { if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { (*sc->sc_rcomp->decomp_reset)( sc->sc_rc_state); s = splnet(); sc->sc_flags &= ~SC_DC_ERROR; splx(s); } } } break; } } /* * CCP is down; free (de)compressor state if necessary. */ static void ppp_ccp_closed(struct ppp_softc *sc) { if (sc->sc_xc_state) { (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); sc->sc_xc_state = NULL; } if (sc->sc_rc_state) { (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); sc->sc_rc_state = NULL; } } #endif /* PPP_COMPRESS */ /* * PPP packet input routine. * The caller has checked and removed the FCS and has inserted * the address/control bytes and the protocol high byte if they * were omitted. */ void ppppktin(struct ppp_softc *sc, struct ppp_pkt *pkt, int lost) { pkt->p_hdr.ph_errmark = lost; if (ppp_pkt_enqueue(&sc->sc_rawq, pkt) == 0) schednetisr(NETISR_PPP); } /* * Process a received PPP packet, doing decompression as necessary. */ #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ TYPE_UNCOMPRESSED_TCP) static void ppp_inproc(struct ppp_softc *sc, struct mbuf *m) { struct ifnet *ifp = &sc->sc_if; int s, ilen, xlen, proto, rv; u_char *cp, adrs, ctrl; struct mbuf *mp, *dmp = NULL; u_char *iphdr; u_int hlen; sc->sc_stats.ppp_ipackets++; if (sc->sc_flags & SC_LOG_INPKT) { ilen = 0; for (mp = m; mp != NULL; mp = mp->m_next) ilen += mp->m_len; printf("%s: got %d bytes\n", ifp->if_xname, ilen); pppdumpm(m); } cp = mtod(m, u_char *); adrs = PPP_ADDRESS(cp); ctrl = PPP_CONTROL(cp); proto = PPP_PROTOCOL(cp); if (m->m_flags & M_ERRMARK) { m->m_flags &= ~M_ERRMARK; s = splnet(); sc->sc_flags |= SC_VJ_RESET; splx(s); } #ifdef PPP_COMPRESS /* * Decompress this packet if necessary, update the receiver's * dictionary, or take appropriate action on a CCP packet. */ if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { /* decompress this packet */ rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); if (rv == DECOMP_OK) { m_freem(m); if (dmp == NULL) { /* * no error, but no decompressed packet * produced */ return; } m = dmp; cp = mtod(m, u_char *); proto = PPP_PROTOCOL(cp); } else { /* * An error has occurred in decompression. * Pass the compressed packet up to pppd, which may * take CCP down or issue a Reset-Req. */ if (sc->sc_flags & SC_DEBUG) { printf("%s: decompress failed %d\n", ifp->if_xname, rv); } s = splnet(); sc->sc_flags |= SC_VJ_RESET; if (rv == DECOMP_ERROR) sc->sc_flags |= SC_DC_ERROR; else sc->sc_flags |= SC_DC_FERROR; splx(s); } } else { if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); } if (proto == PPP_CCP) { ppp_ccp(sc, m, 1); } } #endif ilen = 0; for (mp = m; mp != NULL; mp = mp->m_next) ilen += mp->m_len; #ifdef VJC if (sc->sc_flags & SC_VJ_RESET) { /* * If we've missed a packet, we must toss subsequent compressed * packets which don't have an explicit connection ID. */ if (sc->sc_comp) sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); s = splnet(); sc->sc_flags &= ~SC_VJ_RESET; splx(s); } /* * See if we have a VJ-compressed packet to uncompress. */ if (proto == PPP_VJC_COMP) { if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) goto bad; xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); if (xlen <= 0) { if (sc->sc_flags & SC_DEBUG) { printf("%s: VJ uncompress failed " "on type comp\n", ifp->if_xname); } goto bad; } /* Copy the PPP and IP headers into a new mbuf. */ MGETHDR(mp, M_DONTWAIT, MT_DATA); if (mp == NULL) goto bad; mp->m_len = 0; mp->m_next = NULL; if (hlen + PPP_HDRLEN > MHLEN) { MCLGET(mp, M_DONTWAIT); if (m_trailingspace(mp) < hlen + PPP_HDRLEN) { m_freem(mp); /* lose if big headers and no clusters */ goto bad; } } if (m->m_flags & M_PKTHDR) M_MOVE_HDR(mp, m); cp = mtod(mp, u_char *); cp[0] = adrs; cp[1] = ctrl; cp[2] = 0; cp[3] = PPP_IP; proto = PPP_IP; bcopy(iphdr, cp + PPP_HDRLEN, hlen); mp->m_len = hlen + PPP_HDRLEN; /* * Trim the PPP and VJ headers off the old mbuf * and stick the new and old mbufs together. */ m->m_data += PPP_HDRLEN + xlen; m->m_len -= PPP_HDRLEN + xlen; if (m->m_len <= m_trailingspace(mp)) { bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); mp->m_len += m->m_len; mp->m_next = m_free(m); } else mp->m_next = m; m = mp; ilen += hlen - xlen; } else if (proto == PPP_VJC_UNCOMP) { if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) goto bad; xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); if (xlen < 0) { if (sc->sc_flags & SC_DEBUG) { printf("%s: VJ uncompress failed " "on type uncomp\n", ifp->if_xname); } goto bad; } proto = PPP_IP; cp[3] = PPP_IP; } #endif /* VJC */ m->m_pkthdr.len = ilen; m->m_pkthdr.ph_ifidx = ifp->if_index; /* mark incoming routing table */ m->m_pkthdr.ph_rtableid = ifp->if_rdomain; if ((proto & 0x8000) == 0) { #if NBPFILTER > 0 /* * See whether we want to pass this packet, and * if it counts as link activity. */ adrs = *mtod(m, u_char *); /* save address field */ *mtod(m, u_char *) = 0; /* indicate inbound */ if (sc->sc_pass_filt.bf_insns != 0 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, ilen, 0) == 0) { /* drop this packet */ m_freem(m); return; } if (sc->sc_active_filt.bf_insns == 0 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *)m, ilen, 0)) sc->sc_last_recv = getuptime(); *mtod(m, u_char *) = adrs; #else /* * Record the time that we received this packet. */ sc->sc_last_recv = getuptime(); #endif } #if NBPFILTER > 0 /* See if bpf wants to look at the packet. */ if (ifp->if_bpf) bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_IN); #endif rv = 0; switch (proto) { case PPP_IP: /* * IP packet - take off the ppp header and pass it up to IP. */ if ((ifp->if_flags & IFF_UP) == 0 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { /* interface is down - drop the packet. */ m_freem(m); return; } m->m_pkthdr.len -= PPP_HDRLEN; m->m_data += PPP_HDRLEN; m->m_len -= PPP_HDRLEN; ipv4_input(ifp, m); rv = 1; break; #ifdef INET6 case PPP_IPV6: /* * IPv6 packet - take off the ppp header and pass it up to IPv6. */ if ((ifp->if_flags & IFF_UP) == 0 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { /* interface is down - drop the packet. */ m_freem(m); return; } m->m_pkthdr.len -= PPP_HDRLEN; m->m_data += PPP_HDRLEN; m->m_len -= PPP_HDRLEN; ipv6_input(ifp, m); rv = 1; break; #endif default: /* * Some other protocol - place on input queue for read(). */ if (mq_enqueue(&sc->sc_inq, m) != 0) { if_congestion(); rv = 0; /* failure */ } else rv = 2; /* input queue */ break; } if (rv == 0) { /* failure */ if (sc->sc_flags & SC_DEBUG) printf("%s: input queue full\n", ifp->if_xname); ifp->if_iqdrops++; goto dropped; } ifp->if_ipackets++; ifp->if_ibytes += ilen; if (rv == 2) (*sc->sc_ctlp)(sc); return; bad: m_freem(m); dropped: sc->sc_if.if_ierrors++; sc->sc_stats.ppp_ierrors++; } #define MAX_DUMP_BYTES 128 static void pppdumpm(struct mbuf *m0) { char buf[3*MAX_DUMP_BYTES+4]; char *bp = buf; struct mbuf *m; static char digits[] = "0123456789abcdef"; for (m = m0; m; m = m->m_next) { int l = m->m_len; u_char *rptr = mtod(m, u_char *); while (l--) { if (bp > buf + sizeof(buf) - 4) goto done; /* convert byte to ascii hex */ *bp++ = digits[*rptr >> 4]; *bp++ = digits[*rptr++ & 0xf]; } if (m->m_next) { if (bp > buf + sizeof(buf) - 3) goto done; *bp++ = '|'; } else *bp++ = ' '; } done: if (m) *bp++ = '>'; *bp = 0; printf("%s\n", buf); } static void ppp_ifstart(struct ifnet *ifp) { struct ppp_softc *sc; sc = ifp->if_softc; (*sc->sc_start)(sc); } void ppp_pkt_list_init(struct ppp_pkt_list *pl, u_int limit) { mtx_init(&pl->pl_mtx, IPL_TTY); pl->pl_head = pl->pl_tail = NULL; pl->pl_count = 0; pl->pl_limit = limit; } int ppp_pkt_enqueue(struct ppp_pkt_list *pl, struct ppp_pkt *pkt) { int drop = 0; mtx_enter(&pl->pl_mtx); if (pl->pl_count < pl->pl_limit) { if (pl->pl_tail == NULL) pl->pl_head = pl->pl_tail = pkt; else { PKT_NEXTPKT(pl->pl_tail) = pkt; pl->pl_tail = pkt; } PKT_NEXTPKT(pkt) = NULL; pl->pl_count++; } else drop = 1; mtx_leave(&pl->pl_mtx); if (drop) ppp_pkt_free(pkt); return (drop); } struct ppp_pkt * ppp_pkt_dequeue(struct ppp_pkt_list *pl) { struct ppp_pkt *pkt; mtx_enter(&pl->pl_mtx); pkt = pl->pl_head; if (pkt != NULL) { pl->pl_head = PKT_NEXTPKT(pkt); if (pl->pl_head == NULL) pl->pl_tail = NULL; pl->pl_count--; } mtx_leave(&pl->pl_mtx); return (pkt); } struct mbuf * ppp_pkt_mbuf(struct ppp_pkt *pkt0) { extern struct pool ppp_pkts; struct mbuf *m0 = NULL, **mp = &m0, *m; struct ppp_pkt *pkt = pkt0; size_t len = 0; do { MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) goto fail; MEXTADD(m, pkt, sizeof(*pkt), M_EXTWR, MEXTFREE_POOL, &ppp_pkts); m->m_data += sizeof(pkt->p_hdr); m->m_len = PKT_LEN(pkt); len += m->m_len; *mp = m; mp = &m->m_next; pkt = PKT_NEXT(pkt); } while (pkt != NULL); m0->m_pkthdr.len = len; if (pkt0->p_hdr.ph_errmark) m0->m_flags |= M_ERRMARK; return (m0); fail: m_freem(m0); ppp_pkt_free(pkt0); return (NULL); } #endif /* NPPP > 0 */